Journal article
Accurate FT-value measurements for 22Mg and 34Ar
Bulletin of the American Physical Society, Vol.48(8), pp.28-28
01 Oct 2003
Abstract
We have studied the decays of 22Mg and 34Ar as part of our program to refine the test of CKM unitarity via superallowed 0+-to-0+ *b-decays. In each case, we bombarded an LN-cooled hydrogen gas target with a heavy-ion beam, and separated the recoil products in the MARS spectrometer. A pure beam of the isotope of interest exited the vacuum system, was degraded, collected for about 2 half-lives and the activity moved by a fast tape-transport system to a shielded detection location. The primary beam was turned off during the counting period. For branching-ratio measurements, *b-*g coincidences were recorded with a well-calibrated HPGe detector; for half-life measurements, the emitted *b's were recorded for up to 20 half-lives with a 4-*p proportional gas counter. The required precision (about 0.1% for the superallowed transition) demanded careful attention to possible systematic errors; thus, the experiment was subdivided into numerous runs, each with different settings for critical parameters. For 22Mg, we measured the superallowed branching ratio and half-life to be 0.5315(12) and 3.8755(12) s; for 34Ar, we obtained 847.0(37) ms for the half-life, and a preliminary branching ratio consistent with, but more precise than the previously known value.
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Details
- Title
- Accurate FT-value measurements for 22Mg and 34Ar
- Creators
- V IacobJ HardyA AzhariC GagliardiE MayesR NeilsonN NicaM Sanchez-VegaL TracheR Tribble
- Publication Details
- Bulletin of the American Physical Society, Vol.48(8), pp.28-28
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Identifiers
- 991021863515304721